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Cubic strontium sodium niobate red fluorescent powder and preparation method thereof

A technology of red fluorescent powder and sodium strontium niobate, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high sintering temperature, uneven particles, low color purity, etc., and achieve high powder purity and uniform particle size , good effect of crystallization performance

Inactive Publication Date: 2017-05-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current synthesis methods of phosphors mainly include high-temperature solid-phase method, homogeneous co-precipitation method, sol-gel method, combustion method, hydrothermal method, etc. The existing problems include high sintering temperature, long synthesis cycle, uneven particles, Color purity is not high

Method used

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  • Cubic strontium sodium niobate red fluorescent powder and preparation method thereof
  • Cubic strontium sodium niobate red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) with SrCO 3 and Nb 2 o 5 As raw materials, weigh them respectively according to the molar ratio of 0.825:1, place the weighed raw materials in an agate mortar, grind them at room temperature for 2 hours to make them evenly mixed before use;

[0024] 2) Let SrCO 3 and Nb 2 o 5 The total mass of M (M = M SrCO3 +M Nb2O5 ), the mass of NaCl is m, and NaCl is weighed as a molten salt according to the ratio of M:m=1:5, and it is mixed with the raw material obtained in step 1), and the mixture is fully ground at room temperature for 2 hours to obtain a mixed powder;

[0025] 3) Place the mixed powder obtained in step 2 in Al 2 o 3 Al in the crucible 2 o 3 cover covered.

[0026] 4) Al 2 o 3 Put the crucible in the furnace, start from room temperature, raise the temperature to 600°C at a rate of 3°C / min, then raise the temperature to 1150°C at a rate of 5°C / min, cool down to 300°C at a rate of 2°C / min after holding for 9 hours, and then Take it out with the fur...

Embodiment 2

[0031] 1) with SrCO 3 and Nb 2 o 5 As raw materials, weigh them respectively according to the molar ratio of 0.75:1, place the weighed raw materials in an agate mortar, grind them at room temperature for 2 hours to make them evenly mixed before use;

[0032] 2) Let SrCO 3 and Nb 2 o 5 The total mass of M (M = M SrCO3 +M Nb2O5 ), the mass of NaCl is m, and NaCl is weighed as a molten salt according to the ratio of M:m=1:3, and mixed with the raw material obtained in step 1), and the mixture is fully ground at room temperature for 2 hours to obtain a mixed powder;

[0033] 3) Place the mixed powder obtained in step 2 in Al 2 o 3 Al in the crucible 2 o 3 cover covered.

[0034] 4) Al 2 o 3 Place the crucible in the furnace, start from room temperature, raise the temperature to 600°C at a rate of 3°C / min, then raise the temperature to 1100°C at a rate of 5°C / min, cool down to 300°C at a rate of 2°C / min after holding for 6 hours, and then Take it out with the furnace ...

Embodiment 3

[0037] 1) with SrCO 3 and Nb 2 o 5 As raw materials, weigh them separately according to the molar ratio of 0.675:1, place the weighed raw materials in an agate mortar, grind them at room temperature for 2 hours to make them evenly mixed and then set aside;

[0038] 2) Let SrCO 3 and Nb 2 o 5 The total mass of M (M = M SrCO3 +M Nb2O5), the mass of NaCl is m, and NaCl is weighed as a molten salt according to the ratio of M:m=1:5, and it is mixed with the raw material obtained in step 1), and the mixture is fully ground at room temperature for 2 hours to obtain a mixed powder;

[0039] 3) Place the mixed powder obtained in step 2 in Al 2 o 3 Al in the crucible 2 o 3 cover covered.

[0040] 4) Al 2 o 3 Place the crucible in the furnace, start from room temperature, raise the temperature to 600°C at a rate of 3°C / min, then raise the temperature to 1150°C at a rate of 5°C / min, cool down to 300°C at a rate of 2°C / min after holding for 3 hours, and then Take it out with ...

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Abstract

The invention discloses a cubic strontium sodium niobate red fluorescent powder and a preparation method thereof. The method includes the steps of: 1) weighing SrCO3 and Nb2O5 as raw materials according to the molar ratio of (0.625-0.875):1, placing the weighed raw materials in a mortar, and grinding the raw materials at room temperature until the raw materials are mixed uniformly for later use; 2) placing an Al2O3 crucible in a furnace, maintaining the temperature at 1100-1200 DEG C for 3-9 h, cooling the crucible to 300 DEG C at the rate of 2 DEG C / min, cooling the crucible along with the furnace to room temperature and taking the crucible out. The cubic strontium sodium niobate powder having dispersed appearance and uniform distribution is produced in a molten salt manner. Compared with other methods, the molten salt method is easy to carry out and is controllable in granularity, has good crystal morphology and high physical-phase purity, and is short in synthesis period. The method is suitable for preparing cubic particle powder which is dispersed uniformly. Through the molten salt method, the cubic strontium sodium niobate (Na0.5Sr0.25NbO3) powder is completely crystallized, has dispersed appearance and uniform particles, and is high in color purity.

Description

technical field [0001] The invention belongs to the technical field of white light LED phosphor matrix preparation, and relates to a cubic sodium strontium niobate red phosphor and a preparation method thereof, in particular to a method for preparing Na 0.5 Sr 0.25 NbO 3 powder method. Background technique [0002] Niobate is a kind of phosphor matrix material widely used. It has good thermal and chemical stability and is easy to modify and dope. It has been widely used in ferroelectric, dielectric and piezoelectric fields. Niobates such as barium strontium niobate, sodium potassium niobate, and sodium strontium niobate also show valuable application potential in ceramics, thin films, and photocatalysis. Among them, sodium strontium niobate has a tetragonal tungsten bronze structure, which is a derivative of the perovskite structure. In this special structure, cations are easily replaced by rare earth ions, which makes it a very suitable matrix for doping and is used in ...

Claims

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Application Information

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IPC IPC(8): C09K11/67
CPCC09K11/673
Inventor 史永胜董晨石景俊权博
Owner SHAANXI UNIV OF SCI & TECH
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